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When events are not handled on cc, they will be re-coalesced and handled
on main thread. Use the original latency instead of coalesced latency
in tracing.

Bug: 789041
Change-Id: Ie9bfd7339b45c4a78ca8065a63cd6d61d0dfc051
Reviewed-on: https://chromium-review.googlesource.com/1049059Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558691}